Pearsall



@uitrit 'tutte tttmt @frn IMPROVEMENT IN DRAUGH'I PIPES FOR LOGOMOTIVES.

@te Stimuli referat in it time ettets tteut mit mating mit nf ilg time.'

TO ALL WHOM IT MAY 4CONCIilR-N:

Be it knownl that I, A. PEARSALL, of Atlanta, in the county ot'` Fulton, and State of Georgia, have invented a new and useful Improvement in Draught Pipe for Locomotive Engines; and I do hereby declare tha-t the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the saine, reference being had to the accompanying drawings, forming part of this specification, in which- Figure lis a vertical longitudinal section of my improved draught pipe, showing its position in the smoke box.

Figure 2 is a vertical cross-section of the same.

Similar letters of reference indicate like parts.

The object of this invention is'to equalize the draught through the boiler ues, thereby improving the effective operation of the engine; and it consists in the draught pipe having openings furnished with exterior and interior projecting lips or flanges, in combination with the smoke box and exhaust pipes, as hereinafter more fully described.

A is the smoke box formed at the forward end of the-boiler in the ordinary manner, into which the ends of the boiler hues open, into which the exhaust pipes lead, and from which the smoke and steam escapr` into the air through the smoke stack. B is the draught pipe, which is placed in the smoke box A directly in front of the open ends of the boiler fines. The rear side of the draught pipe B has openings, G, formed in it, as shown in figs. 1 and 2. From the upper exterior edges of the openings C lips or anges, D, project outward in an inclined position; and from the lower interior edges 0f said openings lips or anges, E, project inward and upward, as shown in i-g. I. The lower edges of the draught pipe B, on its front and sides, ex tend down to the bottom of the smoke box A, but the lower edge of the rear side is out away, as shown in the drawings, so as to leave an opening, which, in a mediiim-sized locomotive, should-be about six inches high. F are the ends of the exhaust pipes, which open into the middle of the lower part of the pipe B. As the steam is exhausted into and passes up through the draught pipe B, the lips or fiauges Vof the openings C deiiect it towards the front side of the pipe B, tending to form` a vacuum in front of the said openings C. This produces a strong and uniform draught through all the boiler iues, the dead air in front of the draught pipe B also tending to produce the same result. v Y

I do not cl'aiui any of the parts the subject-matter oi' the patents granted to James M. Foss, June 12,1866, and James L. Vanclaim, August 20, 1861; but I do claim- In combination with the exhaust pipe F and the draught pipe B, having downwardly projecting lips D on its outer face and openings C, the upwardly projecting anges E on the inner face of the pipe,` for the purpose' described substantially as specified.

A. PEARSALL.

Witnesses:

WM. Burr, E. J. HOUSTON, A. A. GAULDING. 

